The Welsh Corgi is a small type of herding dog that originated in Wales. Two distinct breeds are recognized: the Pembroke Welsh Corgi and the Cardigan Welsh Corgi, with the Pembroke being the more common. Corgis are healthy dogs, living into their early or middle teens; however, both do suffer from a few hereditary diseases. Corgis are herding dogs and perform their duties by nipping at the heels; the dog's low stature allows it to avoid being kicked in the process. As herding dogs, Corgis work livestock differently than other breeds. Instead of gathering the cattle the way a Collie would, by running around the livestock, Corgis drive the herd forward by nipping at their heels and working them from behind in semicircles.

There are two breeds of Welsh Corgis, the Cardigan and the Pembroke, each named for the counties in Wales where they originated. The only difference to those unfamiliar with the breed often appears to be that the Cardigan Welsh Corgi has a tail, while the Pembroke does not. However, closer examination of the two breeds reveals differences in bone structure, body length, and overall size that indicate separate origins.